Multiple LED Omni-Directional Visual Alarm Device

摘要

A visual alarm indicating output device includes a plurality of light sources arranged in a circular pattern about a centerline. Each of the sources is oriented so that respective light output is directed to a common, cylindrical Fresnel lens. The lens is symmetrical about the centerline. The sources are pulsed from a common current supply.

主权项

1. A visual output device comprising:
a Fresnel type lens, symmetrical about a central axis, wherein the lens has a partly bounded interior region; and a plurality of light sources symmetrically distributed about the central axis in the partly bounded interior region wherein the sources are located a predetermined distance from the lens, and, when energized, the sources simultaneously emit respective light pulses which upon passing through the lens provide a predetermined, omni-directional, light output pattern, relative to the central axis.